Calculating machine



Dec- 16, 1941 H. K. F. EWALD ETAL 2,266,182

` CALCULATING MACHINE Filed Aug. 23, 1938 3 Sheets-Sheet l A@ 1 Wawaa rfy r1 Dec. 16, 1941.

CALGULATING MACHINE Filed Aug. 23, 1938Y 3 Sheets-Sheet 2 H. F. EWALDETAL 2,266,182

Dec. 16,'1941. H. K. F. EwALD ETAL CALCULATING MACHINE Filed Aug. 23,1938 3 Sheets-'Sheet 3 J J s c m m 0 l Zd H 2dr www@ Ewf MFEQM if@ HGM.,5%

Patented Dec. 16, 1941 CALCULATING MACHINE Heinrich Konrad FriedrichEwald, Chemnitz,

Friedrich Gustav Hugo Eggers, Siegmar-Schonau, and Ernst Max Tndler,Chemnitz, Germany, assignor to Wanderer-Werke' Aktiengesellschait,Siegmar-Schonau, Germany Application August 23, 1938, Serial No. 226,370In Germany August 26, 1937 (Cl. 23S-130) 2 Claims.

This-invention relates to printing calculating machines and has for itsobject a safety device for preventing unauthorized interference ormeddling with the machines a'nd more particularly every unauthorized useor disarrangement of the machine by any unauthorized person and againstan unauthorized change of the setting by the operator. It is thereforean object of this invention to provide a lock mechanism to lock theframe carrying control members to prevent an unauthorized setting orchanging of the machine.

In accordance with the invention a lock is provided for this purposetheclosing of which shuts off or arrests all the means which are actuatedby the digit keys and sign keys as well as arresting the transverselyslidable carriage. The arresting may be limited thereto that the saidmeans, that is the calculating and printing mechanisms of the machinecannot be actuated, but that the keys themselves may be pressed downwithout however having any influenceon the other elementsl otherwiseactuated thereby, and said keys automatically returning to theirposition of rest.

It is furthermore advantageous, when driving the machine by an electricmotor, to provide a special switch for the motor in the feed circuit,which switch is opened by closing the lock in accordance with thepresent invention. Although the motor generally is not switched on butin the case calculating and printing mechanisms are broug'ht intoaction, it may however be desired to switch it oi independently thereofin order to prevent the motor from being started, by unauthorizedinterference of any kind. y

Furthermore, a latch or arrester is suitably provided for the keys ofthe total taking mechanism or for the elements actuated thereby andpreferably by means of a special lock therefor, whereby there will bepresented the possibility of preventing the operator to take totals.

Finally in order to prevent any unauthorized change in the setting ofthe paper carriage control of the machine either by the operator or anyother person, a machine having a rider, such as for instance a framecarrying control tappets and being securedfon the paper carriage, may beprovided with a latch for locking the means which secure the frame onthe paper carriage,

chine. In accordance with this invention any release of the framecarrying the control tappets for changing the adjustment of the tappetsis therefore prevented when the machine is locked, because the carriageis arrested, that is, it cannot be brought into that end positionwherein the carrying frame can be released for changing the position ofany tappets. But even during the working of the machine, any such changeof the tappet positions can be prevented, when there is a possibility ofrelease of the carrying frame in the carriage end position by operatingthe said latch by means of a special key-operated lock providedtherefor.

Of the last named devices, that is the locking latch for the keys of thetotal taking mechanism and that for the arresting of the carrying frame,

lmay also be arranged the one alone.

The drawings illustrate diagrammatcally the invention and show in Fig. 1a calculating machine in plan view partly in section.

Fig. 2 a side view in the direction of the arrow A of Fig. 1 and partlyin section,

Fig. 3 a side view in the direction of the arrow B of Fig. 1 and partlyin section,

Fig. 4 a side view also in the direction of arrow B of Fig. 1 partly insection along line IV of said figure, and

Fig. 5 a section taken on line V-V of Fig. 1.

Upon the main frame or casing I of the calculating machine there isarranged on one side a lock 2, Fig. 1, the crank-like member 3 of whichcarries a pivot pin 4, Fig. '4, upon which the rod 5 is pivoted andwhich also engages the slide 6 horizontally movable in a long slotprovided in the stand I. The member 3 is fastened to the shaft 2 of thelock 2. The rotation of the member 3 in both directions is limited by apin 3 which is provided on the machine frame I; The other end of the rod5 as shown in Fig. 4 grips the pin 1 of the lever 8, which latter ismounted on the shaft 9 mounted in bearings in the main frame I. Thisshaft also carries a second lever I0 connected with the rocker I3turning on a pivot I2 in the main frame I, by means of the rod II whichis parallel to the key surfaces. Motor keys I5, each provided with aside nose Il, are arranged in the casing I. On pins I6 are suspended thelatches I1, which together with the rocker I3 form an arresting chainbetween the members of which, at any one time only a single one of thenoses I4 can be situated, so that also only one of the motor keys I5 canbe depressed in coupling position.

In the casing I at the side ofthe shaft 9 a shaft I8 is revolublymounted. A lever I9 is mounted on shaft I8 and having a pin 20engagingin a longitudinal slot in the rod 2I which is linked to the pinI of the lever 8.

On shaft I8 are provided levers 22, one for each o rder f the amountkeys 23 and for the row of sign keys 24.` In each lever 22 there is aslot in which the pin 25 engages. There is a pin 25 on each releasingrail 26, which latter is arranged slidably under the key surfaces in themain frame I and which is actuated by a spring 21. Each rail 26possesses a plurality of hooked noses 23, for holding down the keys 23and 26 which are depressed against the force of the springs 26.

A lever 36 on shaft I8 is provided at right angle to the levers 22 andthis lever 36 is provided with a longitudinal slot, into which the pin32 projects which is fastened on the releasing key 3l. The shaft i6 alsocarries the lever 33 as shown in Fig. 2 which lever can be rotated inclockwise direction for locking the arm 36, this arm being pivoted onpin 35 in the casing I at a distance below the total key 36 for takingthe totals from the accumulatore. The arm 3d may also be locked by therotatable member 3'iof a lock 38, this lock being positioned on the sidewall of the casing I.

The slide 6 engages a lever 36 which is rotatably mounted on the bottomof casing I, and the other end of the lever is engaged by the rod 6@which transfers its movement to the vertically slidable shaft 42 throughthe intermediary of a bell crank lli as shown in Fig. 3. The shaft orrod i2- acts from below on the lever member 66, which is under inuenceof the tension spring d3, Fig. 5, and one arm of which carries internalteeth situated opposite the gear wheel d5 for driving the carriage.

To the slide 6 there is also linked the push rod 46 which acts with itsstud di of insulating material on the control spring @8 pushing againstthe contact 69.l This contact breaker formed by these two contactingmembers may serve for disconnecting the feed current for the drivingmotor of the machine.

In the carriage 5I, Fig. 5, is mounted on bearing points or pins 52, 53a box-like frame 56, which may serve for reception oi members forcontrolling the paper carriage column positions and various functions ofthe machine. Such members are for instance shown in French 63, whiletensioning the spring 65, is turned by the lug 66 arranged in the mainframe I, thus setting the lever 58 free, so that the tooth059 can bedisengaged from the gear Wheel 56 by operating the lock 62. The bearingpoint 53 may now be screwed out far enough to permit the removal of theframe 5U from the carriage.

If after the use of the machine the lock 2 is operated, then the member3 turns upwards counter-clockwise from the working position of themachine shown in Figs. 3 and 4. It then pushes the slide 6 towards theright, so that the contact spring 48 is lifted from the correspondingcontact 49 thereby breaking the motor circuit. By the displacement ofthe slide 6 the lever 36 is turned and the rod 40 drawn forwardly in themachine whereby the shaft 42 drops by its own weight. 'Ihe lever member44 can now be turned by the spring 43 thereby placing its toothed arc inmesh with the gear wheel 45 thus arresting the same, so thatconsequently no movement of the carriage is possible. Furthermore, themember 3 has also displaced the rods Patent No. '795,028 and in thecorresponding U. S. application Serial No. 39,065, filed September 3,1935. This patent shows control tappets and control members inv a framewhich is .re'

movably secured on the paper carriage as shown in Figs. 14 to 16. Thebearing point 53 is threaded into. the carriage andcan accordingly beaxially adjusted by means ofthe hand wheel 54. Unscrewing the pin willpermit the lifting out of the frame 50 from the carriage 5I for examplefor changing the positions of control members. Upon the bearing pin 53there is secured the gear wheel 56 under the .hood or casing 55. Withinthe hood a two armed lever 58 is mounted to turn on the pivot 51, saidlever 58 carrying a tooth 59 opposite the gear wheel 56 and isbifurcated at its4 end, Fig. 2. The crank-like member 66 engages thebifurcated arm of the lever 58 by means of a pin 6I, said member beingpart of the lock 62A provided on the casing 55. I'he other end of thelever 53 is arrested by the angular latch 63 pivoted on the pin 64 inthecarriage 5l. When the carriage 5I arrives in its right hand endposition, then the angular latch or links 5 and 2l, Fig. 4, and therebyrotated the shafts 9 and I3 counter-clockwise. The shaft 9 thus'drivesthe rod II forward in the machine and has also turned the rocker I3 onits pivot,

whereby the latter becomes pressed against the arresting latch Il, sothat the row of arresters or latchesis now closed and thus no motor keycan be depressed. By shaft I 8 the rails 26 are also moved forward inthe machine through the intermediary of lever 22, Fig. 3. Should thenone of the amount keys 23 be touched, it cannot produce any displacementof the rail 26, but does also not engage below the corresponding hookednose 29 of the rail 26, and will not accordingly be held depressed, butwill instead immediately jump up, as soon as released. No positioning ofthe rails 6l is thus possible, their moving moreover being stopped onaccount of the non-rotation of the motor.

With the turning of the shaft I8 the lever 33 is turned clockwiseupwards, Fig. 2, which shows the other side of the machine. Thus it willgrip under the arm 34 and hold it stationary, so that the total keycannot be depressed any more.

After the use of the machine the carriage is generally placed in thevmiddle position. The angular latch 63, actuated by the spring 65, thenlies in the path 'of the lever 58. The same cannot therefore be broughtinto the position to set the gear wheel 56 free by the opening the lock62, so that any unscrewing of the bearing points 53 and consequentremoval of the frame 50 is made impossible. The latter, can, therefore,only be taken out when theA lock isopen, but the lock can only be openedwith the carriage in end position but on the contrary however, it can beclosed with the can'iage inany'position.

Advantageously the construction of the lock 62 may be of such a kindthat its key can only beV removed with the lock in closed position. -Theoperator of the machine-would be compelled to close the frame lock', ifhe wants to take away his key at the end of the operation. If he thenalso dutifully locks the main lock 2 of the mal chine, then every partof the latter is arrested in a number of ways and accordingly anyunauthorized use is also actually prevented, even if the motor currentcut out and furthermore the removal of the frame carrying the controlmembers in made impossible in case the carriage does not stand in itsright hand end position. Y

Even in the latter case any change of the adjustment of the controlmembers is, however. only possible with the lock 02 unlocked. Also suchchange by the operator is therefore prevented when the key for the locki2 is withheld from him. The same also applies to the total key 3i whichhas already been arrested by the closing of the main lock l, but whichkey itself may also be locked -by means of the lock 38. By means of thelock 3l the operator may also be pre, vented from taking totals, if onlyhis superio will take the totals.

The releasing key 3| is not disturbed or moved by turning the shaft Ilupon closing the lock 2, because its pin 32 is not carried along withthe longitudinal slot of the lever 3l. When again the lock 2 isnpen theshaft Il can be turned'by tapping the releasing` key Il, without movingthe rod 2|,forthe reason that the pin 2l of the lever Il can move freelyin the long slot of the rod (Fig. 4). The releasing key can thereforeduring the use of the machine be used without hindrance and withouthaving any iniiu .ce on the lock 2.

We claim as our invention:

1.*A calculating or like machine comprising a machine frame, a carriageslidably arranged on the machine frame. a box-like frame, means forsecuring the box-like frame on the carriage. an operable member forlocking the securing means, a latch for' locking the said member in itslocking position, a spring forcing the latch to its locking position,and an abutment provided on the machine frame for bringing the latch toan inoperative position in a certain column position of the carriageagainst the action of the spring.

2. A machine according to claim 1, in which a key-operable lock isprovided for operating the locking member only when the latch has beenbrought to the inoperative position.

HEINRICH KONRAD FRIEDRICH EWALD. FRIEDRICH GqsTAv HUGO EGGERs. ERNST MAXTANDLER.

